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Mac OS X Catalina goes to sleep right after I start watching video/youtube. I also can hear how its fan's extensively working. It started after I installed MineCraft, but this maybe just a coincidence as it's going to sleep mode only when watching a vide. But right after it's in sleep mode when I push a power button it wakes up with no fan's noise.

I even did a recovery on the OS, the issue remains.

I looked at other SO threads but they were not helpful.

Not sure if this is Catalina's issue or not...

Just wanted to know is there's anything I should try before I decide to downgrade the OS.

UPDATE

I had to delete my answer as I discovered the issue remains. Also I noticed random restarts. After I restart I see these message in the report:

Mac OS version: 19E287

Kernel version: Darwin Kernel Version 19.4.0: Wed Mar 4 22:28:40 PST 2020; root:xnu-6153.101.6~15/RELEASE_X86_64 Kernel UUID: AB0AA7EE-3D03-3C21-91AD-5719D79D7AF6 Kernel slide:
0x0000000004400000 Kernel text base: 0xffffff8004600000 __HIB text base: 0xffffff8004500000 System model name: iMac15,1 (Mac-FA842E06C61E91C5) System shutdown begun: NO Panic diags file available: YES (0x0)

System uptime in nanoseconds: 330571042058 last loaded kext at 122597264899: com.google.drivefs.filesystems.dfsfuse 37.0.8 (addr 0xffffff7f88d27000, size 102400) last unloaded kext at 208687925513:

usb.!UHostPacketFilter 1.0 (addr 0xffffff7f857fa000, size 24576) loaded kexts: com.google.drivefs.filesystems.dfsfuse 37.0.8 com.symantec.ips.kext 9.0.2 com.symantec.nfm.kext 9.0.1 com.symantec.internetSecurity.kext 9.0.3 com.symantec.SymXIPS 9.0.1 !AUpstreamUserClient 3.6.8 @kext.AMDFramebuffer 3.0.8 AudioAUUC 1.70 @kext.AMDRadeonX4000 3.0.8 @kext.AMDRadeonServiceManager 3.0.8 !AGraphicsDevicePolicy 5.1.16 @AGDCPluginDisplayMetrics 5.1.16 @fileutil 20.036.15 !AHV 1 |IOUserEthernet 1.0.1 |IO!BSerialManager 7.0.4f6 pmtelemetry 1 !APlatformEnabler 2.7.0d0 AGPM 111.4.4 X86PlatformShim 1.0.0 !AMikeyHIDDriver 131 !A!IHD5000Graphics 14.0.5 @Dont_Steal_Mac_OS_X 7.0.0 eficheck 1 !AHDA 283.15 !AMikeyDriver 283.15 @kext.AMD9000!C 3.0.8 !AThunderboltIP 3.1.4 !ALPC 3.1 |!ABCM5701Ethernet 10.3.5 !ASMCLMU 212 AirPort.BrcmNIC 1400.1.1 !A!IFramebufferAzul 14.0.5 !A!ISlowAdaptiveClocking 4.0.0 !AMCCSControl 1.11 @filesystems.autofs 3.0 !AVirtIO 1.0 @filesystems.hfs.kext 522.100.5 @!AFSCompression.!AFSCompressionTypeDataless 1.0.0d1 @BootCache 40 @!AFSCompression.!AFSCompressionTypeZlib 1.0.0 @filesystems.apfs 1412.101.1 @private.KextAudit 1.0 !ASDXC 1.7.7 !AAHCIPort 341.0.2 !AACPIButtons 6.1 !ARTC 2.0 !AHPET 1.8 !ASMBIOS 2.1 !AACPIEC 6.1 !AAPIC 1.7 $!AImage4 1 @nke.applicationfirewall 303 $TMSafetyNet 8 @!ASystemPolicy 2.0.0 |EndpointSecurity 1 @kext.AMDRadeonX4070HWLibs 1.0 @kext.AMDRadeonX4000HWServices 3.0.8 !AGraphicsControl 5.1.16 |IOAVB!F 840.3 !ASSE 1.0 @plugin.IOgPTPPlugin 840.3 DspFuncLib 283.15 @kext.OSvKernDSPLib 529 @!AGPUWrangler 5.1.16 |IONDRVSupport 575.1 !AHIDKeyboard 209 !AHDA!C 283.15 |IOHDA!F 283.15 |IOEthernetAVB!C 1.1.0 !ASMBusPCI 1.0.14d1 |IO80211!F 1200.12.2b1 mDNSOffloadUserClient 1.0.1b8 corecapture 1.0.4 |IOSkywalk!F 1 @kext.AMDSupport 3.0.8 @!AGraphicsDeviceControl 5.1.16 |IOAccelerator!F2 438.4.5 |IOSlowAdaptiveClocking!F 1.0.0 X86PlatformPlugin 1.0.0 IOPlatformPlugin!F 6.0.0d8 !ASMBus!C 1.0.18d1 |IOGraphics!F 575.1 !AThunderboltEDMSink 4.2.3 @kext.triggers 1.0 |Broadcom!BHost!CUSBTransport 7.0.4f6 |IO!BHost!CUSBTransport 7.0.4f6 |IO!BHost!CTransport 7.0.4f6 |IO!B!F 7.0.4f6 |IO!BPacketLogger 7.0.4f6 usb.!UHub 1.2 usb.networking 5.0.0 usb.!UHostCompositeDevice 1.2 |IOAudio!F 300.2 @vecLib.kext 1.2.0 |IOSerial!F 11 |IOSurface 269.11 @filesystems.hfs.encodings.kext 1 !AThunderboltDPInAdapter 6.2.6 !AThunderboltDPOutAdapter 6.2.6 !AThunderboltDPAdapter!F 6.2.6 !AThunderboltPCIDownAdapter 2.5.4 |IOAHCIBlock!S 316.100.5 !AThunderboltNHI 5.8.6 |IOThunderbolt!F 7.6.0 |IOAHCI!F 290.0.1 usb.!UXHCIPCI 1.2 usb.!UXHCI 1.2 |IOUSB!F 900.4.2 !AEFINVRAM 2.1 !AEFIRuntime 2.1 |IOSMBus!F 1.1 |IOHID!F 2.0.0 $quarantine 4 $sandbox 300.0 @kext.!AMatch 1.0.0d1 DiskImages 493.0.0 !AFDEKeyStore 28.30 !AEffaceable!S 1.0 !AKeyStore 2 !UTDM 489.101.1 |IOSCSIBlockCommandsDevice 422.101.1 !ACredentialManager 1.0 KernelRelayHost 1 !ASEPManager 1.0.1 IOSlaveProcessor 1 |IOTimeSync!F 840.3 |IONetworking!F 3.4 |IOUSBMass!SDriver 157.101.3 |IOSCSIArchitectureModel!F 422.101.1 |IO!S!F 2.1 |IOUSBHost!F 1.2 !UHostMergeProperties 1.2 usb.!UCommon 1.0 !ABusPower!C 1.0 |CoreAnalytics!F 1 !AMobileFileIntegrity 1.0.5 @kext.CoreTrust 1 |IOReport!F 47 !AACPIPlatform 6.1 !ASMC 3.1.9 watchdog 1 |IOPCI!F 2.9 |IOACPI!F 1.4 @kec.pthread 1 @kec.Libm 1 @kec.corecrypto 1.0

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    If you think it's being caused by Minecraft, try uninstalling it. – Aryan Beezadhur Apr 2 '20 at 10:40
  • I don’t think it’s because of the Minecraft – Askar Apr 2 '20 at 10:41
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    You mentioned that it started when you installed Minecraft, so save all your game data and uninstall Minecraft, see if this fixes the issue. – Aryan Beezadhur Apr 2 '20 at 19:54
  • Thanks. I have minecraft removed and surprisingly not sudden sleeps. Keep observing today and share how it goes... – Askar Apr 3 '20 at 2:46
  • @AryanBeezadhur thanks for editing. Fan's not working when PC in a sleep mode. Instead, it goes to a sleep mode after fan's intensive work. :) – Askar Apr 9 '20 at 11:50
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I found out I was experiencing the issue ONLY when using Chrome browser, when I switched to Safari.

Then when I checked the version of the Chrome browser, I noticed it was having issues with automatic update.

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Then I manually downloaded the latest version of the Chrome browser and don't have the issue anymore.

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